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Remind, a San Francisco-based app, has an investment led by Kleiner Perkins and includes Social+Capital Partnership and First Round Capital, according to the Wall Street Journal. Remind, formerly Remind101, lets teachers sign up for the app and get a code to share with both students and their parents. The app then allows them to send homework assignments, reminders or even encouraging notes.

Students and parents can similarly respond with comments or voicemails. All messages are "archived within the app" and are accessible by school administration. Early in the school year, Remind was adding 300,000 users a day, according to Remind founder and chief executive Brett Kopf.

Most of the app's users are in the United States and it hasn't expanded beyond North America. The investment will likely expand Remind's reach. There also hasn't been much talk about how Remind will monetize the app, but if it's chief clientele are teachers and students, its monetization possibilities are limited to those advertisers deemed family-friendly.